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Date: Thu, 22 Oct 2015 00:37:42 +0800
From: Lan Tianyu <tianyu.lan@...el.com>
To: bhelgaas@...gle.com, carolyn.wyborny@...el.com,
donald.c.skidmore@...el.com, eddie.dong@...el.com,
nrupal.jani@...el.com, yang.z.zhang@...el.com, agraf@...e.de,
kvm@...r.kernel.org, pbonzini@...hat.com, qemu-devel@...gnu.org,
emil.s.tantilov@...el.com, intel-wired-lan@...ts.osuosl.org,
jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
john.ronciak@...el.com, linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org, matthew.vick@...el.com,
mitch.a.williams@...el.com, netdev@...r.kernel.org,
shannon.nelson@...el.com
Cc: Lan Tianyu <tianyu.lan@...el.com>
Subject: [RFC Patch 10/12] IXGBEVF: Add lock to protect tx/rx ring operation
Ring shifting during restoring VF function maybe race with original
ring operation(transmit/receive package). This patch is to add tx/rx
lock to protect ring related data.
Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
---
drivers/net/ethernet/intel/ixgbevf/ixgbevf.h | 2 ++
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 28 ++++++++++++++++++++---
2 files changed, 27 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
index 6eab402e..3a748c8 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
@@ -448,6 +448,8 @@ struct ixgbevf_adapter {
spinlock_t mbx_lock;
unsigned long last_reset;
+ spinlock_t mg_rx_lock;
+ spinlock_t mg_tx_lock;
};
enum ixbgevf_state_t {
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 15ec361..04b6ce7 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -227,8 +227,10 @@ static u64 ixgbevf_get_tx_completed(struct ixgbevf_ring *ring)
int ixgbevf_tx_ring_shift(struct ixgbevf_ring *r, u32 head)
{
+ struct ixgbevf_adapter *adapter = netdev_priv(r->netdev);
struct ixgbevf_tx_buffer *tx_buffer = NULL;
static union ixgbevf_desc *tx_desc = NULL;
+ unsigned long flags;
tx_buffer = vmalloc(sizeof(struct ixgbevf_tx_buffer) * (r->count));
if (!tx_buffer)
@@ -238,6 +240,7 @@ int ixgbevf_tx_ring_shift(struct ixgbevf_ring *r, u32 head)
if (!tx_desc)
return -ENOMEM;
+ spin_lock_irqsave(&adapter->mg_tx_lock, flags);
memcpy(tx_desc, r->desc, sizeof(union ixgbevf_desc) * r->count);
memcpy(r->desc, &tx_desc[head], sizeof(union ixgbevf_desc) * (r->count - head));
memcpy(&r->desc[r->count - head], tx_desc, sizeof(union ixgbevf_desc) * head);
@@ -256,6 +259,8 @@ int ixgbevf_tx_ring_shift(struct ixgbevf_ring *r, u32 head)
else
r->next_to_use += (r->count - head);
+ spin_unlock_irqrestore(&adapter->mg_tx_lock, flags);
+
vfree(tx_buffer);
vfree(tx_desc);
return 0;
@@ -263,8 +268,10 @@ int ixgbevf_tx_ring_shift(struct ixgbevf_ring *r, u32 head)
int ixgbevf_rx_ring_shift(struct ixgbevf_ring *r, u32 head)
{
+ struct ixgbevf_adapter *adapter = netdev_priv(r->netdev);
struct ixgbevf_rx_buffer *rx_buffer = NULL;
static union ixgbevf_desc *rx_desc = NULL;
+ unsigned long flags;
rx_buffer = vmalloc(sizeof(struct ixgbevf_rx_buffer) * (r->count));
if (!rx_buffer)
@@ -274,6 +281,7 @@ int ixgbevf_rx_ring_shift(struct ixgbevf_ring *r, u32 head)
if (!rx_desc)
return -ENOMEM;
+ spin_lock_irqsave(&adapter->mg_rx_lock, flags);
memcpy(rx_desc, r->desc, sizeof(union ixgbevf_desc) * (r->count));
memcpy(r->desc, &rx_desc[head], sizeof(union ixgbevf_desc) * (r->count - head));
memcpy(&r->desc[r->count - head], rx_desc, sizeof(union ixgbevf_desc) * head);
@@ -291,6 +299,7 @@ int ixgbevf_rx_ring_shift(struct ixgbevf_ring *r, u32 head)
r->next_to_use -= head;
else
r->next_to_use += (r->count - head);
+ spin_unlock_irqrestore(&adapter->mg_rx_lock, flags);
vfree(rx_buffer);
vfree(rx_desc);
@@ -377,6 +386,8 @@ static bool ixgbevf_clean_tx_irq(struct ixgbevf_q_vector *q_vector,
if (test_bit(__IXGBEVF_DOWN, &adapter->state))
return true;
+ spin_lock(&adapter->mg_tx_lock);
+ i = tx_ring->next_to_clean;
tx_buffer = &tx_ring->tx_buffer_info[i];
tx_desc = IXGBEVF_TX_DESC(tx_ring, i);
i -= tx_ring->count;
@@ -471,6 +482,8 @@ static bool ixgbevf_clean_tx_irq(struct ixgbevf_q_vector *q_vector,
q_vector->tx.total_bytes += total_bytes;
q_vector->tx.total_packets += total_packets;
+ spin_unlock(&adapter->mg_tx_lock);
+
if (check_for_tx_hang(tx_ring) && ixgbevf_check_tx_hang(tx_ring)) {
struct ixgbe_hw *hw = &adapter->hw;
union ixgbe_adv_tx_desc *eop_desc;
@@ -999,10 +1012,12 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
struct ixgbevf_ring *rx_ring,
int budget)
{
+ struct ixgbevf_adapter *adapter = netdev_priv(rx_ring->netdev);
unsigned int total_rx_bytes = 0, total_rx_packets = 0;
u16 cleaned_count = ixgbevf_desc_unused(rx_ring);
struct sk_buff *skb = rx_ring->skb;
+ spin_lock(&adapter->mg_rx_lock);
while (likely(total_rx_packets < budget)) {
union ixgbe_adv_rx_desc *rx_desc;
@@ -1078,6 +1093,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
q_vector->rx.total_packets += total_rx_packets;
q_vector->rx.total_bytes += total_rx_bytes;
+ spin_unlock(&adapter->mg_rx_lock);
return total_rx_packets;
}
@@ -3572,14 +3588,17 @@ static void ixgbevf_tx_map(struct ixgbevf_ring *tx_ring,
struct ixgbevf_tx_buffer *tx_buffer;
union ixgbe_adv_tx_desc *tx_desc;
struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[0];
+ struct ixgbevf_adapter *adapter = netdev_priv(tx_ring->netdev);
unsigned int data_len = skb->data_len;
unsigned int size = skb_headlen(skb);
unsigned int paylen = skb->len - hdr_len;
+ unsigned long flags;
u32 tx_flags = first->tx_flags;
__le32 cmd_type;
- u16 i = tx_ring->next_to_use;
- u16 start;
+ u16 i, start;
+ spin_lock_irqsave(&adapter->mg_tx_lock, flags);
+ i = tx_ring->next_to_use;
tx_desc = IXGBEVF_TX_DESC(tx_ring, i);
ixgbevf_tx_olinfo_status(tx_desc, tx_flags, paylen);
@@ -3673,7 +3692,7 @@ static void ixgbevf_tx_map(struct ixgbevf_ring *tx_ring,
/* notify HW of packet */
ixgbevf_write_tail(tx_ring, i);
-
+ spin_unlock_irqrestore(&adapter->mg_tx_lock, flags);
return;
dma_error:
dev_err(tx_ring->dev, "TX DMA map failed\n");
@@ -3690,6 +3709,7 @@ dma_error:
}
tx_ring->next_to_use = i;
+ spin_unlock_irqrestore(&adapter->mg_tx_lock, flags);
}
static int __ixgbevf_maybe_stop_tx(struct ixgbevf_ring *tx_ring, int size)
@@ -4188,6 +4208,8 @@ static int ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
break;
}
+ spin_lock_init(&adapter->mg_tx_lock);
+ spin_lock_init(&adapter->mg_rx_lock);
return 0;
err_register:
--
1.8.4.rc0.1.g8f6a3e5.dirty
--
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